All, thanks for sharing your thoughts!
She's turning 6 this month and she never was jumped before. I go to the jump from trot, and we just go right through - no even attempt of jumping - nice steady trot over it. She does not knock it down either (it's not a cross rails, but a real one). I agree 1 foot is not that high, but she's short and with short legs, so I'm just surprised.
My paint who is taller and longer legged jumps over though. I think I'll try to canter and see if she'll jump then.
Oh, I wouldn't say she's on lazy side, but on laid back and "OK, OK" type of attitude. :)